Armando Martínez Sagi (28 April 1906 – 11 July 1997) was a Spanish footballer who played as a forward for FC Barcelona and Alfonso XIII (now known as RCD Mallorca).

[1] He won two Copa del Rey titles with Barça, in 1922 and 1925,[2] but he is best known for being the club's youngest-ever player and scorer in an official competitive match, which he achieved in 1920 at the age of 14.

[4][5] The nice figure of Martínez Sagi, who was simply marvelous on Sunday, resolutely advanced towards the goal, outwitting one of Avenç's formidable defenders, and with a wonderful low shot, he achieved the tie and a much bigger applause.

Four months later, on 6 March 1921, Sagi scored his first official competitive goal for Barcelona, netting a brace in a 3–1 win over Avenç de l'Sport in the first leg of a Catalan Championship play-off set to decide the winner (as they had finished level on points), which Barça eventually won.

[3] In doing so at the age of 14 years and 307 days, he became the youngest scorer in the club's history, breaking the previous record which had also been set by Alcántara in 1912, although the Philippine managed to seal a hat-trick, unlike Sagi,[3] who finished the 1920–21 season with five competitive matches, scoring twice.